Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/activation.yml

@@ -12,7 +12,7 @@ jobs:
         uses: game-ci/unity-request-activation-file@v2
       # Upload artifact (Unity_v20XX.X.XXXX.alf)
       - name: Expose as artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ steps.getManualLicenseFile.outputs.filePath }}
           path: ${{ steps.getManualLicenseFile.outputs.filePath }}

.github/workflows/unity-tests.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           githubToken: ${{ secrets.GITHUB_TOKEN }}
       - name: Upload results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: unity-test-results
           path: artifacts

.github/workflows/unity.yml

@@ -33,7 +33,7 @@ jobs:
           targetPlatform: ${{ matrix.targetPlatform }}
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Frog-${{ matrix.targetPlatform }}
           path: build/${{ matrix.targetPlatform }}
@@ -60,7 +60,7 @@ jobs:
           targetPlatform: ${{ matrix.targetPlatform }}
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Frog-${{ matrix.targetPlatform }}
           path: build/${{ matrix.targetPlatform }}